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Property and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment consisted of the following at December 31:
(dollars in thousands)Estimated
Useful Life
in Years		20242023
Land—$10,351 $10,351 
Buildings and improvements
3 to 39
51,880 44,352 
Construction equipment
3 to 12
586,335 578,563 
Office equipment
3 to 10
16,883 16,177 
665,449 649,443 
Less: accumulated depreciation and amortization(387,223)(380,465)
$278,226 $268,978 
Construction equipment includes assets under finance leases — see additional information provided in Note 4 — Lease Obligations to the Financial Statements.
Depreciation and amortization expense of property and equipment for the years ended December 31, 2024, 2023 and 2022 was $60.3 million, $54.2 million and $49.2 million, respectively.